# !/usr/bin/env python
"""
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements.  See the NOTICE file
distributed with this work for additional information
regarding copyright ownership.  The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License.  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

Ambari Agent

"""

_all__ = ["HdfsResource"]
from resource_management.core.base import Resource, ForcedListArgument, ResourceArgument, BooleanArgument

"""
Calling a lot of hadoop commands takes too much time.
The cause is that for every call new connection initialized, with datanodes, namenode.

While this resource can gather the directories/files to create/delete/copyFromLocal.
And after just with one call create all that.

action = create_delayed / delete_delayed. Are for gathering information  about what you want
to create.

After everything is gathered you should execute action = execute. To perform delayed actions

The resource is a replacement for the following operations:
  1) hadoop fs -rmr
  2) hadoop fs -copyFromLocal
  3) hadoop fs -put
  4) hadoop fs -mkdir
  5) hadoop fs -touchz
  6) hadoop fs -chmod
  7) hadoop fs -chown
"""


class HdfsResource(Resource):
  # Required: {target, type, action}
  # path to hadoop file/directory
  target = ResourceArgument(default=lambda obj: obj.name)
  # "directory" or "file"
  type = ResourceArgument()
  # "create_delayed" or "delete_delayed" or "execute"
  action = ForcedListArgument()
  # if present - copies file/directory from local path {source} to hadoop path - {target}
  source = ResourceArgument()
  owner = ResourceArgument()
  group = ResourceArgument()
  mode = ResourceArgument()
  logoutput = ResourceArgument()
  recursive_chown = BooleanArgument(default=False)
  recursive_chmod = BooleanArgument(default=False)
  change_permissions_for_parents = BooleanArgument(default=False)

  security_enabled = BooleanArgument(default=False)
  principal_name = ResourceArgument()
  keytab = ResourceArgument()
  kinit_path_local = ResourceArgument()
  user = ResourceArgument()
  hadoop_bin_dir = ResourceArgument()
  hadoop_conf_dir = ResourceArgument()
  
  # WebHDFS needs these
  hdfs_site = ResourceArgument()
  default_fs = ResourceArgument()

  #action 'execute' immediately creates all pending files/directories in efficient manner
  #action 'create_delayed/delete_delayed' adds file/directory to list of pending directories
  actions = Resource.actions + ["create_on_execute", "delete_on_execute", "execute"]
